They were scoured clear of soil ages ago, but one may sometimes find moss or lichens growing, though virtually no flowering plants.
很多年前这里的土壤已经被冲刷干净，实际上已找不到开花植物的踪影，但有时还能发现地衣和苔藓。
We speculate about what the Earth looked like when there were no trees, when there were no flowering plants, and when the continental land masses were in different positions than they are today.
我们都在设想没有树木，没有显花植物，甚至各大洲的位置都与现今不同的时候，这个地球是什么样子的。
We speculate about what the Earth looked like when there were no trees, when there were no flowering plants, and when the continental land masses were in different positions than they are today.
我们都在设想没有树木，没有显花植物，甚至各大洲的位置都与现今不同的时候，这个地球是什么样子的。
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